语法填空（共10小题；每小题1.5分，满分15分）
阅读下面短文，按照句子结构的语法性和上下文连贯的要求，在空格处填入一个适当的词或使用括号中词语的正确形式填空，并将答案填写在答题卷标号为31-40的相应位置上。
The president’s message to students was simple: study hard, pay attention in class and embrace the opportunity to learn.
"We can have the most dedicated teachers, the most   31   (support) parents and the best schools in the world. And none of it will make a difference; none of it will matter,   32  all of you fulfill(履行) your responsibilities," Mr. Obama said.
It was a presidential talk  33  (deliver) at a time of economic uncertainty for many American families. Mr. Obama said he understood the tensions   34  many students faced. But that was no excuse  35  neglecting their homework or cutting class or dropping out of school.
Critics of the president strongly criticized the speech as an effort by the White House to promote the president's domestic agenda. Some parents  36  (tell) their children to resist the address.
A Colorado student stayed away,   37  (think) their parents should be  38  to push them more in their education rather than the president.
But   39  mother in North Carolina said she thought the   40  (speak) could have a positive impact. "When kids get to hear something about motivation from someone like that, it's fantastic," she said.